closes #389 - Create api/lessons page that returns object of lessons data

pages/api/lessons.test.js

@@ -0,0 +1,40 @@
+import lessonsAPI from './lessons'
+import noop from '../../helpers/noop'
+import * as getLessons from '../../graphql/queryResolvers/lessons'
+
+describe('lessonsAPI', () => {
+  const res = {
+    json: jest.fn(noop),
+    status: jest.fn(noop)
+  }
+
+  getLessons.lessons = jest
+    .fn()
+    .mockReturnValue(['man', 'bear', 'pig', 'manbearpig'])
+
+  test('should respond with 200 status code when there is no error', async () => {
+    await lessonsAPI(null, res)
+    expect(res.status).toBeCalledWith(200)
+  })
+
+  test('should respond with json data from lessons() when there is no error', async () => {
+    await lessonsAPI(null, res)
+    expect(res.json).toBeCalledWith(['man', 'bear', 'pig', 'manbearpig'])
+  })
+
+  test('should respond with 500 status code when there is an error', async () => {
+    getLessons.lessons = jest.fn().mockImplementation(() => {
+      throw new Error('Error')
+    })
+    await lessonsAPI(null, res)
+    expect(res.status).toBeCalledWith(500)
+  })
+
+  test('should respond with error message when there is an error', async () => {
+    getLessons.lessons = jest.fn().mockImplementation(() => {
+      throw new Error('Error occured :(')
+    })
+    await lessonsAPI(null, res)
+    expect(res.json).toBeCalledWith('Error occured :(')
+  })
+})

pages/api/lessons.ts

@@ -0,0 +1,14 @@
+import { lessons } from '../../graphql/queryResolvers/lessons'
+import { LoggedRequest } from '../../@types/helpers'
+import { NextApiResponse } from 'next'
+
+export default async (_: LoggedRequest, res: NextApiResponse) => {
+  try {
+    const allLessons = await lessons()
+    res.status(200)
+    res.json(allLessons)
+  } catch (err) {
+    res.status(500)
+    res.json('Error occured :(')
+  }
+}